I've never had a cell phone that can match the latency of a 80s or 90s landline for local calls. Maybe the audio is as good, but that delay makes calls distinctly worse.
I did the same thing - replaced my laptop with a tablet for a trip. Lenovo P12. It I thought the windowing was great.
The whole experience would have been great, except for one thing which made it unusable for my purposes. Android has that clipboard editor popup that can't be disabled. When using Emacs within Termux, every time I hit ctrl-k, I got that damn popup which blocked a significant amount of the screen for ~10 seconds.
In the late 90s I worked for a company that was afraid of the Internet. They had one computer in a common area that had access to the Internet but not the company's internal network for the ~50 engineers to use.
The internal network was coax Ethernet. I was working on a networking project at the time and ran a packet sniffer on the internal network and saw that some MAC addresses could access the outside world.
I'm lazy and I didn't like having to go halfway across the building, sit at a slow ass computer to download a datasheet, copy it to a floppy, then walk halfway across the building back to my cube, and finally copy it to my computer. Ain't nobody got time for that.
So I modified my network driver to use one of the macaddrs that had internet access. When I needed something from the Internet, I'd load my modified driver then unload it when I was done. Much easier.
I thought I was doing it for such short periods of time that nobody works ever notice. Of course I was wrong.
After about a month I got called into the IT manager's office. And of course the the macaddr I picked belonged to the VP of engineering who also was the son of the president.
Fortunately they understood that young engineers are dumb and do dumb things and let me off with a warning.
A couple years ago, I had a phone interview with one of the big tech companies. The interviewer almost immediately started asking a series of pretty basic questions - something a new grad should be able to answer, where if you can answer one, you can answer them all. I don't have an issue with couple of questions like that to verify the info on my resume is accurate, but he was going on and on with them.
I told him I had a question for him and gave him the question. He giggled and said, "That's an interesting question", then started to ask me another question. I stopped him and asked him to answer my question. He said something along the lines of "this isn't for me to answer your questions".
I ended the interview. I don't think I would have liked working there.